Merge "Listen for EXTRA_PRESENT changes" into rvc-qpr-dev

.../src/com/android/settingslib/fuelgauge/BatteryStatus.java

packages/SystemUI/res/drawable/ic_battery_unknown.xml

packages/SystemUI/res/values/config.xml

packages/SystemUI/res/values/strings.xml

...temUI/src/com/android/keyguard/KeyguardUpdateMonitor.java

...s/SystemUI/src/com/android/systemui/BatteryMeterView.java

...es/SystemUI/src/com/android/systemui/SystemUIService.java

...roid/systemui/statusbar/KeyguardIndicationController.java

.../android/systemui/statusbar/policy/BatteryController.java

...roid/systemui/statusbar/policy/BatteryControllerImpl.java

...android/systemui/statusbar/policy/BatteryStateNotifier.kt

.../systemui/statusbar/KeyguardIndicationControllerTest.java

...roid/systemui/statusbar/policy/BatteryControllerTest.java

...oid/systemui/statusbar/policy/BatteryStateNotifierTest.kt